Correct understanding of the excellent performance of thermal gas mass flowmeter

Correct understanding of the excellent performance of thermal gas mass flowmeter A good quality thermal flowmeter product must have two main features: a good probe manufacturing process and a complete real-flow calibration device. Let's analyze these two characteristics separately: a. Probe manufacturing process: We talked about the principle of thermal flowmeter earlier, we can see from the principle that the probe is the core of the entire thermal gas mass flowmeter, and its performance is good or bad It can determine the measurement accuracy, repeatability, service life and low flow rate characteristics of the flowmeter. The probe is composed of platinum resistance wire and sheathed stainless steel. The platinum heating wire conducts electricity, and the stainless steel sheath also conducts electricity, which requires that the spacer between them must have very good thermal conductivity, but it cannot conduct electricity. This leads to the core of all thermal flow meters——The gap filling material and packaging process of the heating probe: The thicker the gap filling layer, although the insulation is better, but the thermal conductivity is poor, and the temperature sensitivity is also poor, and the response is lagging. If the filler is organic, it is easy to age and cause cracks in the filler, and the flowmeter will show zero drift. If there is tiny air in the spacer, since the probe is always in a heated state, the tiny air expands, causing the zero point to fluctuate. b. Real-flow calibration technology: First, let's talk about the importance of real-flow calibration of thermal gas mass flowmeters. We have mentioned the thermal measurement principle before. Through the principle, we know that the measurement of the thermal gas mass flowmeter has a great relationship with the thermal conductivity of the measured gas medium. The specific heat capacity of each gas medium is at different temperatures and pressures. are different. It is unscientific to simply rely on normal pressure or negative pressure air calibration and then correct it to obtain a high-performance flowmeter. Moreover, it has been proved that the flowmeter without actual flow calibration measures the non-air medium, and the data deviation is very large. At present, most thermal gas mass flowmeters on the market are calibrated with open-circuit negative pressure air, and then corrected to high pressure conditions, or corrected to other gases, such as argon, carbon dioxide, oxygen, hydrogen, ammonia, etc. Calibration correction will inevitably lead to measurement accuracy can not be guaranteed, the meter after low pressure calibration is used in high pressure conditions, the meter after air medium calibration is used in other gas media, the measurement accuracy cannot be guaranteed.

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